Bone saw



Aug. 18, 1925.

w. J. DRUCKER BONE SAW 111 April 2, 1933 3 Shoots-Shut 1 NYENTOR WJ, Drucker, /mm R4 WITNESSES ATTORNEYS .Au'g. 1a, 1925. 1,550,520

- 'W. 'J. DRUCKER BONE SAW Filed April 2, 1923 3 Sheets-Shoot 2 IN VE NTbR\ W. J. Driickar A TTORNE YS w, J. DRUCKER Aug. 18,1925.

' BONE 4s med April 2, 1923 3 shuts-shut s Driickm A TTORNE YS Patented Aug. 18, 1925.

UNITED STATES m J. mwcm, OI PITTSBURGH, PENNSYLVANIA.

BONE SAW.

Application fled April II,

To all whom it may concern:

Be it known that I, \VHJJAM J. Dnuonnn, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny, State of Pennsylvania, have lnvente certain new and useful Improvements in Bone Saws, of which the following is a speclfication.

This invention relates to improvements in bone saws.

The present invention is (particularly adapted for retail butchers, an the ob ect of the invention is to provide a bone sawing apparatus or device which can be employed for quickly and efliclently saw1ng bones which may occur in meat being out It is also an object of the inventlon that the apparatus include a table upon which meat to be cut may be placed and also upon which the sawing apparatus may be eflicientl supported.

A. further object of the invention is that the table be adjustable with relation to the saw and also the saw adjustable with relation to the table and thereby to permitthe user to quickly and easily bring meatunto proper position for sawing bones therein.

A still further object of the invention is that the sawing a paratus or device ,be

capable of being shi ted or moved to a position so that the table associated therewith mi 'ht be used for other purposes.

6ther objects, and objects relating to details of construction, combination and arrangement of parts will hereinafter appear in the detailed description to follow.

The invention is illustrated by way of example in the accompanying drawings, and in which:

Figure 1 is a perspective view of a bone sawing apparatus or device constructed in accordance with the present inventlon,

Figure 2 is a transverse vertical sectional view taken through the apparatus and showing in full lines the saw together with its supporting arni' when in operative position and also showing these parts in dotted lines when in their inoperative or raised position,

Figure 3 is a vertical sectional view on line 33 of Figure 2,

Fi ure 4 is a sectional view on line 44 of Figure 1,

Figure 5 is a sectional view on lme 5-5 of Figure 1,

Figure 6 is a group view illustratmg the 1928. Serial No. 628,502.

in Figure 2, and said frame is suitably supported. by legs 12 which may be integral therewith. The vertical portion 13 of each side member of the frame 11 serves as a rail for a plurality of grooved pulleys or I rollers 14, said rollers 14 supporting a table generally indicated by the reference numeral 15. The table 15 may be made of any material and preferably is of a relatively high weight so that the same will not easily move upon the frame 11. The table is provided with a handle 16 whereby the same may be manually shifted longitudinally of the frame 11. The end portions of the frame 11 would, of course, serve as a stop for the rollers 14 and thus to a certain extent limit the longitudinal movement of the table 15.

Upon one side of the table there is bolted a pair of uprights 17, each of said uprights terminating at its upper end in a bearing sleeve 18, and between said bearing sleeves there is journaled a shaft 19. The shaft 19 is preferably square in cross section between the bearings 18 and adjacent the inner side of each bearing the shaft has secured thereto a collar 20 which is formed with a pair of divergent arms 21 integrally connected by an arcuate portion 22. The arcuate portion 22 terminates at each end in a laterally extending lug 23. The lugs 23, as is apparent, limit the rotative movement of the shaft 19 in either direction; that is, these lugs engage with the associated uprights17 and serve as stops for ,the shaft 19. The shaft 19 is reduced at each end in order that the same ma be properly journaled by the sleeves 18 an also this reduced portion extends from each sleeve 18 and has positioned thereon a coil spring 24. This c011 spring is anchored at its one end to the associated post 17, as at 25, and its other end is anchored to one of the studs 26 carried by a nut 27 threzided upon the associated end of the shaft The nuts 27 may be heldin ad usted position by a in or the like, as shown at 28.

pon the shaft 19 there is slidable a block 29 which is provided\ with a set screw 30, whereby the same may be locked in 11:5 adjusted position and which, as shown in Figure 5, carries a plurality of rollers 31 which are adapted to facilitate the movement of the block 29 upon the shaft 19. The block 29 has extending laterally therefrom a pair of bars 31 which cohstitute a supportmg arm for the bone saw. These bars are integrally connected at their outer ends by a handle 32, said handle being preferably cast with the bars 31' and its portion 33 being cylindrical in order to permit the same to be easily grasped. The port on '33 is also provided with a bore extending longitud nally thereof and in which there is positioned a sleeve of insulating material 34, said sleeve having slidable therein a plunger or push button 35. Upon the handle 32 there is also secured an insulating block 36 which carries a pair of contact strips 37 and 38, the similar ends of which project from the strip 36 and each provided with a head 39. These heads are disposed as shown and as is apparent they may be brought lnto contact with each other by manipulating the plunger 35. The purpose of this switch arframe 43 including members journaled at their upper ends upon the ends of the axles 41 and suitably connected at their lower ends. This hanger supports an electric inotor 44, thecasing of'said motor being suitably bolted to the hanger and the shaft of the electric motor 44 is extended at its one end .and has secured thereon a sleeve 45 which is formed with a radial flange 46 at its outer end to which there is bolted a circular saw 47. Also the hanger frame may support a shield 48 for the saw 47. The hanger frame 43 also includes a cross member 49 which is disposed above the pair of rails 31 and which supports the one end of an arm 50' which extends above and across the rails or bars 31. On the cross member 49 there is fulcrumed a latch member 51, as at'52, and the lower end of this latch member is provided with an inwardly extending portion 53 which carries a plurality of teeth 54 adapted to be brought to mesh or engage with the rack 55 carried upon the associated bar 31. A leaf spring 56 is carried by the arm 50 and its free end adapted to engage with the similar end ortion 57 of the latch member 51 and there y to'press thesame so that its teeth 54 will engage with the rack 55 and in this way lock the saw carriage the drawings. The springs 24, as previously stated, tend to rotate the shaft 19 in a clockwise direction and thereby to bring the motor together with the saw in this last-named position. The stops 23 occurring upon the rear ends of the arcuate portions 22 serve to stop further backward movement of the saw and motor, or more particularly, the bars 31.

Vhen a butcher is cutting meat he places the meat upon the table 15 as illustrated in Figure ,1 and he may slide the table 15 to position so that the meat will be in proper position to the saw 47 when lowered. The butcher will, of course, first cut the meat with a knife and then lower the saw for severing the bone. Upon the lowering of the saw and bringing the same into position the butcher need only depressthe plunger 35 whereby to establish an electric current through the motor 44 which will rotate the saw 47 for severing the bone. After the bone has been severed the butcher need only release the handle 32 and the bars 31 together with the motor 44 and saw 47 carried thereby will return to the dotted line position shown in Figure 2. Also if desired the set screw 30 may be loosened and the operator' may slide the bars 31 longitudinally of the shaft 19 and thus again adjust the position of the saw with relation to the table 15 or with relation to the meator other object to be operated upon disposed upon said table.

Referring to Figure 7 of the drawings, the same structure is disclosed with the exception that the motor 60 for driving the saw is differently positioned and suitable-con necting means between the saw and motor are employed. In this arrangement the motor is suitably supported by the block 29 as shown, and adjacent the free end .of one of the bars or rails 31 there is provided a downwardly extending bracket member 61, which journals the outer'end of the shaft 62, said shaft representing an extension of the shaft of motor 60. The carriage 40 supports a casing 63, and through the lower end portion of the casing there passes the shaft 62.

Gil

' the s The shaft 62 carries a driving pinion 64.- which is splined thereon and thereby permittin said inion together with the casing.

to be shifte longitudinally of the shaft. The casing 63 also journals a shaft 65 which may be ri idly secured at its one end to the saw 47 an which may carry a suitable pinion 66 in constant mesh with the drive pinion 64. The motor may be supplied with.

a motor.

The shaft 19 in this construction should carry a grooved sheave 70, over whichthere may pass a short length of cable 71, said cable having its one end secured to the sheave, as at 72, and its other end secured to the spring 73, said spring being adjustably anchored at its other end by a bolt 7 t.

With the arrangement in Fi re 7 the operation of the dev1ce when emp oyed for cutting bones is exactly the same as that of the apparatus shown in Figures 1 to 6, inclusive. In the case of the construction in Figure 7 the s rings 24 emplo ed in connection with liaft 19 may be ispensed with.

Iclaim:

1. An apparatus of the character described, comprising in combination, a table, a shaft rotatably supported above the table,

an arm extending laterally from said shaft,

a rotary saw supported by said arm and movable longitudinally thereon, an electric motor supported by said arm at its point of connection with said shaft, a pulley carried by the shaft, a cable extending about the pulley with one end secured thereto, a spring anchored to the table atone end and its other end secured to the free end of cable whereby to urge the arm to swingiupwardly, and connecting means between t e saw and motor whereby the saw may be rotated.

2. In an apparatus of the character described, a shaft, a pair of standards rotatably supporting said shaft, a pair of divergent radial arms rigid with said shaft and adjacent to one of said standards, stops car- ,ried by said arms and respectively adapted to contact opposite sides of said one standard to limit the rocking movement of said shaft about-its axis in opposite directions, and a saw carrying member slidable axially of said shaft.

' 3. An apparatus of the character described, comprising a table, a shaft rotatably supported above the table, an arm extending radially from the shaft, a rotary saw supported by the arm and adjustable longi tudinally thereof, an electric motor sup ported by the arm at its point of connection with the shaft, a power shaft extending from the motor, rigid means depending from the outer end of said arm for journaling the Y outer and free end of the power shaft, and

means whereby said ower shaft may be employed for rotating t e saw.

4. An apparatus of the character described comprising a table, a shaft rotatably supported above the table, an arm extending radially from the shaft, a rotary saw supported by the arm and adjustable longitudinally thereof, an electric motor supported by the arm at its point of connection with the shaft, a power shaft extending from the motor, rigid means depending from the outer end of said arm for journaling the outer and free-end of the power shaft, a casing depending from the arm and movable with the saw, and said power shaft extending through the walls of the casing, and means within the casing for operatively connecting the saw with said power shaft.

5. An apparatus of the character described comprisin a table, a shaft rotatably supported above t e table, an arm extending laterall from the shaft, a rotary saw su ported y said arm and movable longitu inally thereon, means for operating said saw, a pulley fixed upon the shaft, a cable extending about the pulley with one end secured thereto, a spring anchored to the table at one end and its other end secured to the free end of the table thereby urging the arm to swingin one'direction, and means for adjusting the tension of the spring. 4 

